Advanced developments: Cracking catalysts and additives to them

Abstract

This paper is devoted to the cooperative works of the Institute of Hydrocarbon Processing (Sibe rian Branch, Russian Academy of Sciences) and JSC Gazprom Neft Omsk Refinery on the creation of cracking catalysts and additives to them with the purpose of increasing the yield of C 3 -C 4 olefins, reducing the concentration of sulfur compounds in the gasoline product, and ensuring the afterburning of CO during the regeneration of a catalyst. Bizeolite cracking catalysts, which give yields of C 3 -C 4 olefins of no less than 30 wt % and allow us to vary the composition and yield of target reaction products within wide ranges, are developed. Mixed oxides or modified Y and/or ZSM 5 zeolites are proposed as cracking catalyst additives that result in a 35% reduction in the concentration of sulfur compounds in gasoline (as compared to an equilibrium cata lyst). A manganese oxide based additive is proposed for the efficient afterburning of CO, and a pilot batch of this additive is produced by JSC Gazprom Neft Omsk Refinery and tested at an industrial plant. It is shown that the amount of manganese oxide based additive required to ensure a residual CO concentration of less than 20 ppm is 20% lower than for a platinum containing additive. The developed catalysts and additives to them can be synthesized on the basis of the catalysts produced at JSC Gazprom Neft Omsk Refinery.